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/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0
* utility functions
*/
/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
* (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <netinet/in.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/gsm48.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/transaction.h>
#include <openbsc/paging.h>
#include <openbsc/signal.h>
/* should ip.access BTS use direct RTP streams between each other (1),
* or should OpenBSC always act as RTP relay/proxy in between (0) ? */
int ipacc_rtp_direct = 1;
/* Section 9.1.8 / Table 9.9 */
struct chreq {
uint8_t val;
uint8_t mask;
enum chreq_type type;
};
/* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */
static const struct chreq chreq_type_neci1[] = {
{ 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F },
{ 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H },
{ 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL },
{ 0xe0, 0xe0, CHREQ_T_TCH_F },
{ 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H },
{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
{ 0x00, 0xf0, CHREQ_T_LOCATION_UPD },
{ 0x10, 0xf0, CHREQ_T_SDCCH },
{ 0x80, 0xe0, CHREQ_T_PAG_R_ANY_NECI1 },
{ 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
{ 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
{ 0x67, 0xff, CHREQ_T_LMU },
{ 0x60, 0xf9, CHREQ_T_RESERVED_SDCCH },
{ 0x61, 0xfb, CHREQ_T_RESERVED_SDCCH },
{ 0x63, 0xff, CHREQ_T_RESERVED_SDCCH },
{ 0x7f, 0xff, CHREQ_T_RESERVED_IGNORE },
};
/* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */
static const struct chreq chreq_type_neci0[] = {
{ 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H },
{ 0xe0, 0xe0, CHREQ_T_TCH_F },
{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
{ 0x00, 0xe0, CHREQ_T_LOCATION_UPD },
{ 0x80, 0xe0, CHREQ_T_PAG_R_ANY_NECI0 },
{ 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
{ 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
{ 0x67, 0xff, CHREQ_T_LMU },
{ 0x60, 0xf9, CHREQ_T_RESERVED_SDCCH },
{ 0x61, 0xfb, CHREQ_T_RESERVED_SDCCH },
{ 0x63, 0xff, CHREQ_T_RESERVED_SDCCH },
{ 0x7f, 0xff, CHREQ_T_RESERVED_IGNORE },
};
static const enum gsm_chan_t ctype_by_chreq[] = {
[CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F,
[CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F,
[CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H,
[CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H,
[CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH,
[CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F,
[CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H,
[CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H,
[CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH,
[CHREQ_T_PAG_R_ANY_NECI1] = GSM_LCHAN_SDCCH,
[CHREQ_T_PAG_R_ANY_NECI0] = GSM_LCHAN_SDCCH,
[CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F,
[CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F,
[CHREQ_T_LMU] = GSM_LCHAN_SDCCH,
[CHREQ_T_RESERVED_SDCCH] = GSM_LCHAN_SDCCH,
[CHREQ_T_RESERVED_IGNORE] = GSM_LCHAN_UNKNOWN,
};
static const enum gsm_chreq_reason_t reason_by_chreq[] = {
[CHREQ_T_EMERG_CALL] = GSM_CHREQ_REASON_EMERG,
[CHREQ_T_CALL_REEST_TCH_F] = GSM_CHREQ_REASON_CALL,
[CHREQ_T_CALL_REEST_TCH_H] = GSM_CHREQ_REASON_CALL,
[CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_CHREQ_REASON_CALL,
[CHREQ_T_SDCCH] = GSM_CHREQ_REASON_OTHER,
[CHREQ_T_TCH_F] = GSM_CHREQ_REASON_OTHER,
[CHREQ_T_VOICE_CALL_TCH_H] = GSM_CHREQ_REASON_CALL,
[CHREQ_T_DATA_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER,
[CHREQ_T_LOCATION_UPD] = GSM_CHREQ_REASON_LOCATION_UPD,
[CHREQ_T_PAG_R_ANY_NECI1] = GSM_CHREQ_REASON_PAG,
[CHREQ_T_PAG_R_ANY_NECI0] = GSM_CHREQ_REASON_PAG,
[CHREQ_T_PAG_R_TCH_F] = GSM_CHREQ_REASON_PAG,
[CHREQ_T_PAG_R_TCH_FH] = GSM_CHREQ_REASON_PAG,
[CHREQ_T_LMU] = GSM_CHREQ_REASON_OTHER,
[CHREQ_T_RESERVED_SDCCH] = GSM_CHREQ_REASON_OTHER,
[CHREQ_T_RESERVED_IGNORE] = GSM_CHREQ_REASON_OTHER,
};
/* verify that the two tables match */
osmo_static_assert(sizeof(ctype_by_chreq) ==
sizeof(((struct gsm_network *) NULL)->ctype_by_chreq), assert_size);
/*
* Update channel types for request based on policy. E.g. in the
* case of a TCH/H network/bsc use TCH/H for the emergency calls,
* for early assignment assign a SDCCH and some other options.
*/
void gsm_net_update_ctype(struct gsm_network *network)
{
/* copy over the data */
memcpy(network->ctype_by_chreq, ctype_by_chreq, sizeof(ctype_by_chreq));
/*
* Use TCH/H for emergency calls when this cell allows TCH/H. Maybe it
* is better to iterate over the BTS/TRX and check if no TCH/F is available
* and then set it to TCH/H.
*/
if (network->neci)
network->ctype_by_chreq[CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_H;
if (network->pag_any_tch) {
if (network->neci) {
network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI0] = GSM_LCHAN_TCH_H;
network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI1] = GSM_LCHAN_TCH_H;
} else {
network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI0] = GSM_LCHAN_TCH_F;
network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI1] = GSM_LCHAN_TCH_F;
}
}
}
enum gsm_chan_t get_ctype_by_chreq(struct gsm_network *network, uint8_t ra)
{
int i;
int length;
const struct chreq *chreq;
if (network->neci) {
chreq = chreq_type_neci1;
length = ARRAY_SIZE(chreq_type_neci1);
} else {
chreq = chreq_type_neci0;
length = ARRAY_SIZE(chreq_type_neci0);
}
for (i = 0; i < length; i++) {
const struct chreq *chr = &chreq[i];
if ((ra & chr->mask) == chr->val)
return network->ctype_by_chreq[chr->type];
}
LOGP(DRR, LOGL_ERROR, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra);
return GSM_LCHAN_SDCCH;
}
int get_reason_by_chreq(uint8_t ra, int neci)
{
int i;
int length;
const struct chreq *chreq;
if (neci) {
chreq = chreq_type_neci1;
length = ARRAY_SIZE(chreq_type_neci1);
} else {
chreq = chreq_type_neci0;
length = ARRAY_SIZE(chreq_type_neci0);
}
for (i = 0; i < length; i++) {
const struct chreq *chr = &chreq[i];
if ((ra & chr->mask) == chr->val)
return reason_by_chreq[chr->type];
}
LOGP(DRR, LOGL_ERROR, "Unknown CHANNEL REQUEST REASON 0x%02x\n", ra);
return GSM_CHREQ_REASON_OTHER;
}
int gsm48_extract_mi(uint8_t *classmark2_lv, int length, char *mi_string, uint8_t *mi_type)
{
/* Check the size for the classmark */
if (length < 1 + *classmark2_lv)
return -1;
uint8_t *mi_lv = classmark2_lv + *classmark2_lv + 1;
if (length < 2 + *classmark2_lv + mi_lv[0])
return -2;
*mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
return gsm48_mi_to_string(mi_string, GSM48_MI_SIZE, mi_lv+1, *mi_lv);
}
int gsm48_paging_extract_mi(struct gsm48_pag_resp *resp, int length,
char *mi_string, uint8_t *mi_type)
{
static const uint32_t classmark_offset =
offsetof(struct gsm48_pag_resp, classmark2);
uint8_t *classmark2_lv = (uint8_t *) &resp->classmark2;
return gsm48_extract_mi(classmark2_lv, length - classmark_offset,
mi_string, mi_type);
}
struct msgb *gsm48_create_loc_upd_rej(uint8_t cause)
{
struct gsm48_hdr *gh;
struct msgb *msg;
msg = gsm48_msgb_alloc();
if (!msg)
return NULL;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT;
gh->data[0] = cause;
return msg;
}
struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value)
{
struct msgb *msg;
struct gsm48_hdr *gh;
msg = gsm48_msgb_alloc();
if (!msg)
return NULL;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
gh->data[0] = value;
return msg;
}
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